Black Creek Labs MRX Bison Scout 5.56 NATO 12.5″ Barrel


SKU: BCLBISS55612BLK Categories: , Tag:

The MRX Bison is a compact, light and rugged bolt action rifle that is chambered in 556 NATO.  This rifle would be comfortable in its scabbard on the side of a horse,  packed, slung or mounted onto a Utility Vehicle for ranch, range or backcountry duty.  The vertical pistol grip and adjustable stock allows for the rifle to be shot comfortably in any position and the AR15 spec magazine will continue to feed up to 30 rounds of ammunition (based on legal magazine capacity in your area).  In addition to being compatible with AR15 spec magazines, the MRX Bison also feeds from MRX Mags.  The MRX Mag is a proprietary 20 round bolt action magazine that has longer feed lips and a follower stop that (unlike AR15 mags) allows the action to be closed with a fitted, empty magazine.  The Bison sits in an aluminum, monolithic chassis and is available with 12.5 inch and 16.5 inch barrels.

The Bison is a true utility bolt action that is compatible with AR15 spec magazines, stocks and grips and can accept universal 1913 pic rail accessories.


  • MRX Mag
    • The MRX Bison can be feed from either an AR15 spec mag or the MRX MAG, a 20 round bolt action magazine that is made specifically for the MRX Supershort action.
  • Barrel Shroud
    • To protect the barrel from impacts in harsh environments, or to add forward mounted optics such as night vision, The MRX Bison can be fitted with a barrel shroud.
  • Trigger
    • The MRX Bison is fitted with a TriggerTech trigger. The TriggerTech trigger is known as one of the smoothest single stage “zero creep” triggers on the market and can be adjusted from 2.5 to 5 pounds of pull.


Action Bolt Canadian Legal Classification Non-Restricted
Action Type MRX Supershort Chassis Bison Monolithic Aluminum
Buttstock Magpul MOE Carbine; AR MIL-Spec Buttstock Finish Black
Adjustable Length of Pull 6-Position Telescoping Min Length of Pull (in; cm) ~10.7; 27
Max Length of Pull (in; cm) ~13.9; 35.4 Cheekpiece Risers Available (Sold Seperately)
Grip Magpul MOE-K; AR-Spec Trigger TriggerTech Field; Remington 700
Min Trigger Pull Weight (lbs) 2.5 Max Pull Weight (lbs) 5
Supply Type Detachable Magazines Magazine Compatiblity MRX; AR-15 Spec
Included Magazine (1) 5/30 Round Forend Aluminum
Receiver Material AISI 4140PH Safety 2 Position Receiver Mounted
Bolt Material Hardened AISI 4140 Bolt Throw (Degrees) 60
Bolt Head Profile 3 Lug Optic Interface Pre-installed Full Length Picatinny Rail
Rear Sight None Front Sight None
Barrel Profile Modified Palma Twist Rate (in) 1 in 8
Muzzle Device 2 Gill Muzzle Brake Thread 1/2×28 TPI
Collapsed Length (in; cm) 28.5 Extended Length (in) 33.3
Weight (lbs) 6.9 Accessory Interface Sling Slot Buttstock, Left Side QD Slot Rear Chassis, M-LOK Side/Bottom Forend, Picatinny Top Forend

Additional Information:

Product Code BISS55612BLK


Manufacturers, importers, suppliers, and distributors may make changes to their products without fanfare. Such changes can lead to discrepancies between the advertised product and the actual product in inventory. While International Shooting Supplies Ltd. endeavors to correctly describe the actual product in inventory, we will not be responsible for unintentional inaccuracies in text and images of the advertised product.

Weight 4.2 kg
Dimensions 106.5 × 26.7 × 10.8 cm

5.56 Nato


Black Creek Labs


Shopping Cart